ESP32 Offline Voice Control Kit — Run Keyword Spotting & Relay Without Internet

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

You say “lights on,” the relay clicks, and the lamp glows — all processed right on the ESP32, never touching the cloud. This kit teaches you to train a custom keyword-spotting model in Edge Impulse, deploy it onto an ESP32, and use that local inference to drive a 5V relay module. It’s a privacy-respecting smart home switch you build from scratch.

What You'll Build

A stand-alone voice-controlled appliance switch that listens for two spoken commands — “lights on” and “lights off” — and toggles a relay accordingly. The ESP32 captures audio via the INMP441 I2S microphone, runs a lightweight neural network you trained, and instantly triggers the relay without any WiFi dependency. A 0.96-inch OLED shows the recognized command and relay status in real time. You’ll leave with a working prototype that can control a lamp, fan, or any low-power AC/DC load.

What You'll Learn

• Training a 2-class keyword spotting model in Edge Impulse using your own voice samples
• Deploying a TensorFlow Lite Micro model onto an ESP32 and wiring the I2S microphone for continuous inference
• Interfacing a 5V relay with ESP32 GPIO, including flyback diode protection with 1N4007 diodes
• Displaying prediction confidence and relay state on a 0.96-inch OLED over I2C

Kit Contents

Why Buy This Kit Instead of Sourcing Parts Separately

Who This Kit Is For

Ideal for Class 11-12 students exploring AIoT in CBSE curriculum, B.Tech ECE/EEE undergraduates building a voice-controlled prototype for Smart India Hackathon, and hobbyists who want a completely offline alternative to Alexa or Google Assistant. It also fits perfectly into ATL Tinkering Labs where data privacy and offline functionality are must-haves. If you’ve tinkered with Arduino before and want to cross into embedded machine learning, this kit unlocks that next step.

Built and Backed by Compoden

Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.